All classes shows <not accessible> in "locals and expressions"

Hi all.
I recently downloaded from this site the latest version qt(4.8.4) and qt-creator(2.6.0)
When debugging in the view "locals and expressions" I want to see the state of the members of class, but when I try to open the list of members, I see <not accessible>. Why the debugger does not work?
Example:
@
#include <QApplication>
class qwe{
int x;
public:
qwe(){
x=0xAABBCCDD;
}
};

=thread-group-created,id="8266"
sThread group 8266 created
dTaking notice of pid 8266
=thread-created,id="1",group-id="8266"
sThread 1 created
201^running
dNOTE: ENGINE RUN AND INFERIOR RUN OK
sRunning.
dState changed from EngineRunRequested(7) to InferiorRunOk(11) [master]
dINFERIOR STARTED
sApplication started
*running,thread-id="all"
dNOTE: INFERIOR STILL RUNNING IN STATE InferiorRunOk.